Ensure net dict has provider info on precommit delete
Ensure net dict has provider info on precommit delete

Commit 80eddc40390e63c9c1102b827997054708f2618b optimized
net delete by including net info into notification payload,
however ML2 plugin needs provider info as well.

Closes-Bug: #1942469
Change-Id: I9f753be0ce5ae7870afb9b3cb74f89be8482356e

openstack/neutron,openstack/neutron,mahak/neutron,mahak/neutron,openstack/neutron,mahak/neutron